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Reserves - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]    
Favorable (unfavorable) prior year development $ 25.7 $ 42.7
Global Lifestyle    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Favorable (unfavorable) prior year development 34.1 34.0
Global Housing    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Favorable (unfavorable) prior year development (15.2) 2.9
Corporate and Other    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Favorable (unfavorable) prior year development $ 6.8 $ 5.8